New high T sub c superconductor: (In,Pb,Cu)Sr sub 2 (Ca,Y)Cu sub 2 O sub 7 minus. delta

Journal Article · Mon Aug 19 00:00:00 EDT 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.106322· OSTI ID:5481049

Liu, R S; Hu, S F; Edwards, P P ^[1]

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1. IRC in Superconductivity, University of Cambridge, Madingley Road, CB3 0HE, United Kingdom (GB)

Bulk superconductivity was observed in the new system (In{sub {ital x}}Pb{sub 0.75{minus}{ital x}}Cu{sub 0.25})Sr{sub 2}(Ca{sub 0.5}Y{sub 0.5})Cu{sub 2} O{sub 7{minus}{delta}}. An increase in indium doping, 0{le}{ital x}{le}0.2, into the Pb sites results in an increase in the superconducting transition temperature {ital T}{sub {ital c}} from 45 K for {ital x}=0 to 60 K for {ital x}=0.2. For nominal compositions {ital x}{gt}0.2, a decrease in {ital T}{sub {ital c}} was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be (In{sub 0.06(1)}Pb{sub 0.69(1)}Cu{sub 0.25})Sr{sub 1.99(7)}(Ca{sub 0.47(1)}Y {sub 0.53(2)})Cu{sub 2}O{sub 7{minus}{delta}}; this phase resulted from the synthesis of a sample of nominal composition (In{sub 0.2}Pb{sub 0.55}Cu{sub 0.25})Sr{sub 2}(Ca{sub 0.5}Y{sub 0.5})Cu{sub 2} O{sub 7{minus}{delta}}.

• OSTI ID: 5481049
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:8; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
HIGH-TC SUPERCONDUCTORS
IMPURITIES
INDIUM COMPOUNDS
INDIUM OXIDES
LEAD COMPOUNDS
LEAD OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES